2691245 has 4 divisors (see below), whose sum is σ = 3229500. Its totient is φ = 2152992.

The previous prime is 2691239. The next prime is 2691251. The reversal of 2691245 is 5421962.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2691239) and next prime (2691251).

It can be written as a sum of positive squares in 2 ways, for example, as 438244 + 2253001 = 662^2 + 1501^2 .

It is a cyclic number.

It is not a de Polignac number, because 2691245 - 2¹² = 2687149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269120 + ... + 269129.

It is an arithmetic number, because the mean of its divisors is an integer number (807375).

2^2691245 is an apocalyptic number.

It is an amenable number.

2691245 is a deficient number, since it is larger than the sum of its proper divisors (538255).

2691245 is an equidigital number, since it uses as much as digits as its factorization.

2691245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538254.

The product of its digits is 4320, while the sum is 29.

The square root of 2691245 is about 1640.5014477287. The cubic root of 2691245 is about 139.0969942205.

It can be divided in two parts, 269124 and 5, that multiplied together give a triangular number (1345620 = T₁₆₄₀).

The spelling of 2691245 in words is "two million, six hundred ninety-one thousand, two hundred forty-five".